写一个SQL: student(Sno, Sname, classId, grade )查出每个班成绩前三名的同学
时间：2021-01-11 11:07:05
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SELECT * FROM student stu WHERE (
SELECT COUNT(*) FROM student
WHERE stu.classid=classid AND stu.grade >= grade
GROUP BY classid HAVING COUNT(*)<=3
)
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